Quote:
Originally Posted by BiscuitSlayer
Essentially it is not an afterthought. The whole point is that you don't want the load of the tank, water, substrate, etc. to be transfered through the floater to the floor. You would effectively be taking all of that weight and transfering it to your floor rather than evenly transfering it to the lower frame (which covers more area).
If it doesn't make sense to you now, read the original link to Intermediate_Noobs thread at the top of mine. From there it will take you to the reef central threads where this design was originally thought of.
It is definately not an afterthought. I originally thought like you do, but now I am a believer.
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In addition to this, if the 2x4 was only touching on the top OR the bottom, the screws securing the 2x4 to the rest of the frame will be taking the entire load of the tank. Screws are very weak in this direction (shear force) and they are very likely to break. The way the stand is built, the only shear force that the screws have to withstand is the weight of the 2x4 itself.